| INDIAN INSTITUTE OF TECHNOLOGY Patent applications |
| Patent application number | Title | Published |
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| 20110249568 | BACKOFF ADJUSTMENT METHOD FOR MAC SYSTEM - According to various aspects, a method and system provides an enhanced backoff strategy wherein a backoff period may be determined based on an estimated channel condition if a transmission error is not attributed to a frame collision. | 10-13-2011 |
| 20110150121 | Systems and Methods of Resource Allocation for Cancellation of Crosstalk - A method implemented in a multi-user communication system is described for performing far-end crosstalk (FEXT) cancellation for each victim user. The method comprises performing dynamic programming to allocate resources according to (N−1) normalized disturber coupling values and difference rate function values associated with N total users in the system involved in partial FEXT cancellation. In accordance with some embodiments, dynamic programming comprises selecting a tone and one or more disturbers to be cancelled for the tone. | 06-23-2011 |
| 20110110445 | System and Method for Estimation and Correction of Carrier Frquency Offset in MIMO-OFDM Based Wireless Communications Systems - This invention relates to a Multi-Input Multi-Output Orthogonal Frequency Divisional Multiplexing (MIMO-OFDM) is a transmission technology for many current and next generation wireless communication systems. Carrier Frequency Offset (CFO) Estimation and Correction is one of the most important requirement of the proper reception of MIMO-OFDM Signals. The invention provides a null subcarrier based scheme to accomplish this task. The CFO is estimated by employing the co-variance matrix of the signals on all receiving antennas with a cost function which minimizes the energy falling on the null subcarrier locations due to frequency offset. The proposed approach results in very low computational complexity as it uses a two step procedure, making it very attractive for real time applications. Also a new null subcarrier allocation scheme based on Fibonacci series is proposed which ensures a frequency offset estimation range equal to the maximum possible range equal to the OFDM bandwidth. | 05-12-2011 |
| 20110049506 | STABLE P-TYPE SEMICONDUCTING BEHAVIOUR IN LI AND NI CODOPED ZNO - A method is provided for growing a stable p-type ZnO thin film with low resistivity and high mobility. The method includes providing an n-type Li—Ni co-doped ZnO target in a chamber, providing a substrate in the chamber, and ablating the target to form the thin film on the substrate. | 03-03-2011 |
| 20110007829 | OPTIMAL TRAINING SEQUENCE AND CHANNEL ESTIMATION METHOD AND SYSTEM FOR SUPERIMPOSED TRAINING BASED OFDM SYSTEMS - The present invention relates to a method for minimizing means square estimation error (MSEE) and bit error rate during channel estimation and equalization between a transmitter and a receiver of an orthogonal frequency division multiplexing (OFDM) systems. The method comprises transmitting from said transmitter to said receiver a training sequence for channel estimation being superimposed onto data at specific pilot to data power ratio (PDPR), receiving the OFDM signals along with the training sequence as an input, cross-correlating said received signal to a specific lag determined by the rms delay spread of the channel, with a specific known training sequence stored in a register, and which is also the sequence that is added to the data at the transmitter in the time domain having a prescribed pilot to data power ratio. The cross-correlated data being processed over a length of samples which can be extended to exploit the coherence time of the channel and processed along with the stored values of the inverse of autocorrelation values of superimposed training (ST) sequence so as to obtain a reliable least squares based channel estimate in a way the PDPR is limited or otherwise. The invention also relates to a system comprising means for computing a time domain least squares (LS) based channel estimate at the receiver. | 01-13-2011 |
| 20100080114 | LOW COMPLEXITY BANDWIDTH EFFICIENT CARRIER FREQUENCY OFFSET ESTIMATION TECHNIQUE FOR OFDMA UPLINK TRANSMISSIONS - A system and a method for estimating low complexity bandwidth efficient carrier frequency offset for orthogonal frequency division multiple access (OFDMA) and or single carrier frequency division multiple access (SC-FDMA) uplink transmissions in a communication network systems comprising a group of subscriber stations, a base station including carrier frequency offset unit, said method steps comprising: | 04-01-2010 |
| 20090260984 | Ultra-Sensitive Simultaneous Electrochemical Determination of Arsenic, Mercury and Copper - A sensor for the simultaneous detection of inorganic contaminants, As (III), Hg (II) and Cu (II) in water and having a limit of detection of 0.02 ppb, comprising a conducting support having a layer comprised of a three dimensional silicate network comprised of thiol tail groups immobilized with citrate stabilized gold nanoparticles, wherein the gold nanoparticles have a size in the range of 70 to 100 nm. | 10-22-2009 |
